Error 0x80EF0194

Value: -2131820140 | 0x80EF0194 | 2163147156

What does it mean ?

RTC_E_STATUS_CLIENT_NOT_FOUND  
Not Found
Value: 404 | 0x0194 | 0b0000000110010100

Where does it come from ?

FACILITY_SIP_STATUS_CODE  
SIP - Session Initiation Protocol (VoIP)
Value: 239 | 0x0EF | 0b11101111

Other Errors for FACILITY_SIP_STATUS_CODE